Synthesis of Nitroso-Based Bis-Azo Dyes And Their Dyeing Properties For Polyethylene Terephthalate And Polyamide | ||||
| Egyptian Journal of Chemistry | ||||
| Article 34, Volume 63, Issue 10, October 2020, Page 3949-3959 PDF (773.76 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2020.23484.2427 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Asiagwu K Augustine   1; johnson o otutu2
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| 1Department of chemistry, faculty of science, Delta state university, Abraka, Nigeria. | ||||
| 2department of chemistry, faculty of science, delta state university, Abraka, Nigeria | ||||
| Abstract | ||||
| The main aim of this paper is the synthesis of new azo nitroso-based disperse dyes with better dyeing properties on synthetic fibers. In this regard, bis-azo nitroso naphthalene dyes were synthesized via the diazo coupling reactions of 4-nitroaniline with 1-hydroxy-2-nitrosonapthalene. Products formed were characterized by 1H and 13C NMR. Absorption values in the UV-vis spectra of the derivatives under study were quite close and they exhibited multiple maxima in the 386 – 513nm range. The dyeing process, dye exhaustion on polyethylene terephthalate (PET) and polyamide 6 (nylon 6) fabrics, and the durability of the dyes on the textile substrates were evaluated. It was found that the light fastness ratings of the dyed fabrics could reach grade 6/7 to 7, washing fastness gave excellent values of grade 5 while rubbing and perspiration fastness grades were rated at 4/5 to 5 on the International Geometric Scale. The results obtained suggest that the dyes could be used as disperse dyes on synthetic polymers fibers. | ||||
| Keywords | ||||
| Synthesis; nitroso dyes; characterization; fastness; synthetic substrates | ||||
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